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In a beam model with fiber sections, the perfect bond between steel and concrete is assumed (plane sections remain plain).

If you want to use beam model then you should do something like this:
https://opensees.berkeley.edu/workshop/OpenSeesDays2005_presentations/AA-7%20Modeling%20strain ...

My goal was to add reinforcement to certain areas of the beam, so I divided them into two stages, but the result was even lower than the load-bearing capacity without reinforcement.

STKO Team wrote: ↑

Tue Jan 27, 2026 8:57 am

Sorry but I don't understand your issue. Your model is already attached into a single wire

Compared to the model below, the load-bearing capacity of the model above has decreased significantly.

It's about preventing the steel reinforcement and concrete from coming into contact in the middle area of the beam, but I don't know what to do.

How can I make the two parts of the beam just connected? Right now, because they have become two separate sections, the load-bearing capacity has decreased.

STKO Team wrote: ↑

Fri Jan 23, 2026 8:59 am

What do you mean by "unbonded zone" ?

Concrete is not in contact with the reinforcing steel.

Concrete is not in contact with the reinforcing steel.

Hello,

I am modeling a reinforced concrete beam-column joint and need to create an unbonded zone in a part of the beam, but I don't know how to establish it. If you have any advice, I would be grateful.

Hello,

I am modeling a reinforced concrete beam-column joint and need to create an unbonded zone in a part of the beam, but I don't know how to establish it. If you have any advice, I would be grateful.